/* * Memory-to-memory device framework for Video for Linux 2. * * Helper functions for devices that use memory buffers for both source * and destination. * * Copyright (c) 2009 Samsung Electronics Co., Ltd. * Pawel Osciak, <pawel@osciak.com> * Marek Szyprowski, <m.szyprowski@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the * License, or (at your option) any later version */ #ifndef _MEDIA_V4L2_MEM2MEM_H #define _MEDIA_V4L2_MEM2MEM_H #include <media/videobuf2-core.h> /** * struct v4l2_m2m_ops - mem-to-mem device driver callbacks * @device_run: required. Begin the actual job (transaction) inside this * callback. * The job does NOT have to end before this callback returns * (and it will be the usual case). When the job finishes, * v4l2_m2m_job_finish() has to be called. * @job_ready: optional. Should return 0 if the driver does not have a job * fully prepared to run yet (i.e. it will not be able to finish a * transaction without sleeping). If not provided, it will be * assumed that one source and one destination buffer are all * that is required for the driver to perform one full transaction. * This method may not sleep. * @job_abort: required. Informs the driver that it has to abort the currently * running transaction as soon as possible (i.e. as soon as it can * stop the device safely; e.g. in the next interrupt handler), * even if the transaction would not have been finished by then. * After the driver performs the necessary steps, it has to call * v4l2_m2m_job_finish() (as if the transaction ended normally). * This function does not have to (and will usually not) wait * until the device enters a state when it can be stopped. */ struct v4l2_m2m_ops { void (*device_run)(void *priv); int (*job_ready)(void *priv); void (*job_abort)(void *priv); void (*lock)(void *priv); void (*unlock)(void *priv); }; struct v4l2_m2m_dev; struct v4l2_m2m_queue_ctx { /* private: internal use only */ struct vb2_queue q; /* Queue for buffers ready to be processed as soon as this * instance receives access to the device */ struct list_head rdy_queue; spinlock_t rdy_spinlock; u8 num_rdy; }; struct v4l2_m2m_ctx { /* private: internal use only */ struct v4l2_m2m_dev *m2m_dev; /* Capture (output to memory) queue context */ struct v4l2_m2m_queue_ctx cap_q_ctx; /* Output (input from memory) queue context */ struct v4l2_m2m_queue_ctx out_q_ctx; /* For device job queue */ struct list_head queue; unsigned long job_flags; wait_queue_head_t finished; /* Instance private data */ void *priv; }; struct v4l2_m2m_buffer { struct vb2_buffer vb; struct list_head list; }; void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev); struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx, enum v4l2_buf_type type); void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev, struct v4l2_m2m_ctx *m2m_ctx); static inline void v4l2_m2m_buf_done(struct vb2_buffer *buf, enum vb2_buffer_state state) { vb2_buffer_done(buf, state); } int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, struct v4l2_requestbuffers *reqbufs); int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, struct v4l2_buffer *buf); int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, struct v4l2_buffer *buf); int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, struct v4l2_buffer *buf); int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, enum v4l2_buf_type type); int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, enum v4l2_buf_type type); unsigned int v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, struct poll_table_struct *wait); int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx, struct vm_area_struct *vma); struct v4l2_m2m_dev *v4l2_m2m_init(struct v4l2_m2m_ops *m2m_ops); void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev); struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev, void *drv_priv, int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)); void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx); void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx, struct vb2_buffer *vb); /** * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for * use */ static inline unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx) { return m2m_ctx->cap_q_ctx.num_rdy; } /** * v4l2_m2m_num_src_bufs_ready() - return the number of destination buffers * ready for use */ static inline unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx) { return m2m_ctx->out_q_ctx.num_rdy; } void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx); /** * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready * buffers */ static inline void *v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx) { return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx); } /** * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of * ready buffers */ static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx) { return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx); } /** * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers */ static inline struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx) { return &m2m_ctx->out_q_ctx.q; } /** * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers */ static inline struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx) { return &m2m_ctx->cap_q_ctx.q; } void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx); /** * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready * buffers and return it */ static inline void *v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx) { return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx); } /** * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of * ready buffers and return it */ static inline void *v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx) { return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx); } #endif /* _MEDIA_V4L2_MEM2MEM_H */